Câu hỏi của nguyễn hoa

Question

viêt mỗi số $\dfrac{81}{125}$; $\dfrac{-8}{27}$dưới dạng một lũy thừa

Rem · Accepted Answer

$\dfrac{81}{125}=\dfrac{3^4}{5^3}$

$\dfrac{-8}{27}=\dfrac{\left(-2\right)^3}{3^3}=\left(\dfrac{-2}{3}\right)^3$Câu trả lời: $\dfrac{81}{125}=\dfrac{3^4}{5^3}$

$\dfrac{-8}{27}=\dfrac{\left(-2\right)^3}{3^3}=\left(\dfrac{-2}{3}\right)^3$

Nguyễn Thị Hồng Nhung · Answer

Ta có:

$\dfrac{81}{125}=\dfrac{3^4}{5^4}=\left(\dfrac{3}{5}\right)^4$

$-\dfrac{8}{27}=-\dfrac{2^3}{3^3}=\left(-\dfrac{2}{3}\right)^3$Câu trả lời: Ta có:

$\dfrac{81}{125}=\dfrac{3^4}{5^4}=\left(\dfrac{3}{5}\right)^4$

$-\dfrac{8}{27}=-\dfrac{2^3}{3^3}=\left(-\dfrac{2}{3}\right)^3$